Just wanted to throw in a good word for Manos and Atmizoo. I bought a used Roller off the classys. It was discounted in price because (i) it was fairly beat up (scratches, a dent, plier marks, etc.), and (ii) the switch was not working properly. It was an earlier version and it still had the original switch, which was also apparently missing some parts. I contacted Manos and ordered an updated switch assembly. Manos graciously offered to throw in (for free) several additional parts for me, inlcluding 2 connectors (standard and recessed), a new button, a new battery spring, and several additional extra replacement parts for the internal switch assembly (the small springs, ball bearings, etc.). Manos, I greatly appreciate it. On top of that, installing the new switch assembly was a breeze given the way it was set up (with the white band that just slides off as you push the assembly in) - brilliant. And now, my slightly beatup unit operates flawlessly. The button on this thing is amazing. Great product. It's so small, I love it. With an 18650 battery, it's about the same size as my P+18500. That is, of course, with the bottom battery spring removed (I realize that eliminates one of the built-in safety features, but I do use relatively safe batteries, so I'm not that concerned about it, and it really makes this thing hit hard).
Oh, and Manos also offered to do the button install and buff up the unit for free. I just figured I could handle the install, and I'm pretty rough on my devices anyway, so I'm sure I would have it scratched back up in no time anyway.
Anyway, just wanted to put up some (more) positive feedback for Manos and company, and for the Roller itself. Great product, great service. Thank you.